A combined photocatalytic-biological wastewater treatment approach: a steady-state model: a steady-state model

Zach Shidlovsky, Sima Yaron, Yaron Paz

Research output: Contribution to journalArticlepeer-review


BACKGROUND: Water purification is challenged by the co-presence of contaminants, some of which are too toxic for bacteria or too opaque for photocatalytic processes. This challenge may be overcome by utilizing two types of reactors (for example biological and photocatalytic) operating in sequence. Realization of this approach should be based on a steady state model for calculating the optimal design under nominal conditions, a non-steady state responding to fluctuating conditions and fast measurement of toxicity and turbidity. RESULTS: A steady-state model, examining the effect of coexisting toxicity and turbidity on the optimal sequence, on the relative retention times in the two reactors and on the effect of recycling, under an estimated cost function constraint is presented. It was found that the optimal sequence depends on the relative importance of toxicity and turbidity, that a single branch operation is likely to be more cost effective than dual branch (Bio→photocatalytic in parallel with photocatalytic→Bio) system. CONCLUSION: It is recommended to add the possibility for altering flow direction to account for operation under non-nominal conditions. To decrease instability during flow-direction switching, a recycling option should be added. Recycling may also be beneficial in particular when the activated biological medium has sluggish kinetics.

Original languageEnglish
Pages (from-to)2606-2615
Number of pages10
JournalJournal of Chemical Technology and Biotechnology
Issue number10
StatePublished - Oct 2017


  • Bioreactors
  • Biotreatment
  • Decontamination
  • Modelling
  • Photocatalysis
  • Waste-Water

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry


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